Rotary grate for furnaces.



H1 E. WALLIS. ROTARY GRATBFOR FURNAUES.

APPLIOATION FILED SEPT. 26, 1907.

945,825., Patented Jan. 11,1910.

2 SHEETS-SHEET 2.

T FTQ@ HENRY E. WALLIS, OF TERRE HAUTE` INDIANA.

ROTARY GRA'IE FOR FURNACES.

To all whom it may concern;

Be it known that I, HENRY E. VALLis, of Terre Haute, in the county of Vigo and State of Indiana, have invented certain new and useful Improvements in Rotary Grates for Furnaces, of which the following is a specification.

The object of the present invention is to produce a rotary grate, especially intended for steam boiler furnaces, which shall always rotate freely and easily in such a way as not to be affected by accumulating ashes; and which shall involve a minimum of obstruction on its under side.

This application is a division of application tiled January 8, 1907, Serial Number 351,349.

The improved grate is illustrated in the accompanying drawings in which- Figure l, is a horizontal section through a furnace showing a plan view of the grate, parts being broken away and only a poi'- tion of the grate sections being shown. F ig. 2, is a central vertical section of the grat-e. Fig. 3, is an enlarged section of one side of the grate. F ig. Ll, is a detail plan view of the central portion of the truss spider.

The rotary grate is composed of grate sections g, each of sector shape, and each having a .plurality of separate grate bars furnishing air spaces for the upward passage of air from the ash-pit H, beneath through the fuel on the grate to the combustion chamber D, above, and also providing for the downward passage of the ashes. The outer margins of the grate sections are supported upon an annular bull-ring I. This bull-ring has integral loops 71., with which lugs on the grate sections cooperate, as shown in Fig. 2. The inner ends of the grate sections are supported upon a trussspider consisting of truss-bars J, which meet at the center and each of which has at its outer end a bent end to engage an integral loop i, on the bull-ring. This construction of rotating grate involves the minimum obstruction on the underside of the grate. The lower edge of the bull-ring is stiftened by a ratchet-ring K, bolted thereto having ratchet-teeth on its outer periphery. This ratchet-ring may coperate with any suitable driving mechanism whereby rotary motion may be communicated to the grate. The original application filed January 8, 1907, of which the present application is a Specification of Letters Patent.

Patented Jan. 11,1910.

Divided and this application filed September division, illustrates and describes appropriate mechanism for giving rotary movement to the grate.

It is important that the grate should always rotate freely and easily and in such a way as not to be affected by accumulating ashes. To this end the construction illustrated is employed. The bull-ring I, is located wholly beneath a iixed dead-plate N, and the dead-plate is as close to the bullring as free rotation will permit. The bullring is rotatively located upon a fixed ashring O, and the construct-ion of ash-ring and bull-ring is such as to provide a race-way for anti-friction balls l?. As the result of this construction the bull-ring turns on ball bearings and hence is readily and easily rotated. The ball race is provided by the cooperative constructions of the bull-ring and ash-ring respectively, as best shown in Fig. 3. The bull-ring has a horizontal flange m, an inner vertical wall a, and outer vertical wall p. Similarly, the ash-ring O, has a bottom r, inner vertical wall s, and outer vertical wall 2f. The balls rest on the bottom r, of the ash-ring and the fiange m, of the bull-ring rests on the balls. As shown in Fig. 3, the outer wall 2?, of the ash-ring eX- tends above the center of the balls; while the inner wall of the bull-ring extends below the center of the balls. This is an important feature, taken in connection with the vertical character of these walls, since it prevents the climbing up of the balls, due to their outward thrust, which would cause the bullring to bind and hence fail to rotate.

lith the construction shown the grate always rotates freely and attention is reduced to the minimum.

The ratchet-ring K constitutes the drivering for the rotary grate. It is carried by the bull-ring and is located below the ballrace. It is peripherally driven through the.

ratchet-teeth on its outer surface, so that the bull-ring is peripherally driven around and around in the same direction. The ball-race is hence a continuous peripheral race formed by complete peripheral grooves in the bullring and ash-ring respectively.

I claim- 1. The rotary grate comprising the annular bull-ring, the truss-spider, consisting of radial truss-bars which meet at the center and are there connected together, each trussbar at its outer end being connected to and supported by the bulla'ihg, and the grate sections supported at their outer ends by the bull-rinzg` and at their inner ends by the united inner ends of the truss-bare.

2. rl`he rotary 'furnace grate comprising a peripherally driven bull-ring which is rotated around and around iu the sanie direction. in combination with the ash-ring, said bull-ring and nell-ring being` mutually Jformed with complete peripheral `grooves to provide a Continuous ball-race for antifrietion balls on which the bull-ring rests, a ixed dead-plate coveringl the ash-ring and bull-ring, and as elose to the bull-ring?)l as the ready rotation thereof adniitS7 and a drivering` carried by the bull-ring below the ball,- race.

3. The Combination of the peripherally driVeubull-ring and the ash-ring` of a rotary furnace grate with a continuous peripheralball-race formed partly in both, the inner wall of the portion of the race formed by the bull-ring being substantially Vertical and extending` below the center of the balls, and the wall of the ash-ring constituting the outer wall of the ball-race being` also vertical and extending' above the center of the balls, and a drive-ring Carried by the bull-ring` below the ball-race.

In witness.l whereof, l have hereunto Signed iny naine in the presence of two Subscribing` witnesses.

HENRY E. VALLIS. lVitnesses:

J. IRVING RIDDLE, MAUDE R. SIURLEY. 

